inverse relaxation in spun yarns

this paper presents some experimental data on inverse relaxation exhibited by yarns spun from cotton, polyester, viscose rayon, and jute fibers. inverse relaxation (ir) is the building up of tension in a viscoelastic material that has been allowed to recover a part of the initial extension it is subjected to. the ir index defined as a mea..

yarn package inspection with computer vision and robotics

a system for the automatic inspection of open-end polyester/cotton blend yarn packages, including package transportation and inspection algorithms, has been developed and implemented. an american robot was used to move and position the yarn packages during the inspection procedure. the robot controller served as the host computer and dire..

sewing threads: 25 years of steady progress

marketed under the tradename polyfil, the core spun sewing thread developed by english sewing ltd. is widely used in the stitching trade for its versatility and economy. the thread is produced by spinning superfine cotton around a continuous filament polyester core. this article traces the polyfil story from its development to current app..

effect of using filaments of different extensibilities on surface and in body of short staple cotton yarn

the paper compares the properties of a 100 cotton yarn with that of bicomponent yarns comprising short staple cotton and continuous filaments. two types of bicomponent yarns, one in which the continuous filaments wrap on the surface of the yarn and the other in which the filaments occupy the core position of the yarn, were produced by var..

comparison of properties of cotton yarns produced by the dref-3, ring, and open-end spinning methods

the dref-3 spinning method produces a yarn by wrapping a fibrous core with a fibrous sheath at production speeds up to 200 meters per minute. the comparative merits of this high-production spinning method to spin all-cotton yarns are investigated and reported. two sets of cotton differing mainly in fiber length, strength, and micronaire r..

inverse relaxation in spun yarns

this paper presents some experimental data on inverse relaxation exhibited by yarns spun from cotton, polyester, viscose rayon, and jute fibers. inverse relaxation (ir) is the building up of tension in a viscoelastic material that has been allowed to recover a part of the initial extension it is subjected to. the ir index defined as a mea..

fatigue of cotton and viscose staple yarns by biaxial rotation over a pin

an investigation is reported on the fatigue life of open-end, ring spun, and siro spun yarns using the technique of biaxial rotation over a pin. open-end yarns have a significantly higher fatigue life compared to ring spun yarns. mercerization increases fatigue life. for siro spun yarns, an increase in strand spacing increasing the fatigu..

hairiness of cotton-spun yarns. the effect of fibre properties on measurements made with the zweigle g565 hairiness meter

an experiment was conducted to test the zweigle hairiness tester on the yarn series previously examined with the shirley hairiness meter, and a similar statistical analysis was undertaken by applying the technique of backward regression analysis. the most important results are presented in tabular form. results show that, for ring-spun ya..

evaluation of fiber and yarn from three cotton fiber mutant lines

analysis of the biochemical factors required for improved cotton fiber growth is aided by a collection of near isogenic mutants. the cotton mutants (gossypium hirsutum l. texas marker-1 background) tested in this study include immature fiber, pilose, and naked seed. fiber physical properties for each mutant were determined for two years o..

exploratory study of imperfections in cotton yarns

imperfections in yarns are serious flaws that greatly detract from the quality. they are classified into three categories according to their linear density variations. with a view to studying the physical nature of various imperfections, we investigated carded and combed yarns, estimating correlations between diameter and mass of various ..